After picking up a tremendous amount of moisture from the Gulf of Mexico, the Christmas 2012 storm has moved across the eastern U.S. dumping rain and snow, causing major air traffic disruptions, and traffic jams across the interstates. This image from the NOAA GOES-13 satellite shows the system on December 27, 2012 at 1845z. The center of low pressure can be seen over New England, along with gravity waves in the cloud formations over Pennsylvania, Maryland, and Virginia.